Late Show With David Letterman

On Tuesday's edition of The Late Show with David Letterman on CBS, the Fox News Channel host said that he thinks NBC should rethink its suspension of the NBC Nightly News anchor, who is under investigation for his claims about his time spent reporting on the Iraq War in 2003.

"We have a sport in the United States called let's destroy the famous person," O'Reilly told Letterman. "That's what happened to him. I think NBC should bring him back. I think they will bring them back."

"Everyone's just clapping, and Bill O'Reilly's like this," Ferrell said, mimicking O'Reilly with a hand under his chin looking stone-faced and unamused. "I don't know if he got a wrong seating assignment or something … but just a real sourpuss."

When Aubrey Plaza stopped by Letterman's show on Tuesday, the host, 67, asked what she's going to do now that the show has wrapped. "I have no plan. At all," she deadpanned. "I was thinking of gaining skills – survival skills. Marksmanship, maybe."

Plaza, 30, then turned Letterman's own question on him: "What are you going to do when your show's over?"

"As I was asking you that question," admitted Letterman, "I realized I don't have an answer either."

Emma Stone claims she only recently learned the word selfie. But now she's a pro – snapping them in front of millions.

The Birdman actress, 26, visited CBS's The Late Show on Monday night, and posed for several selfies with host David Letterman.

The pics won't win any awards, but they're cute. And it's fun to see Stone and Letterman hamming it up for the camera – and Letterman's humorous medical explanations for their respective appearances aren't far off, either.